Plymouth is a county in Iowa. It was formed in 1851 (1858) from the following county/ies: unorganized (Delaware/Polk)/*Woodbury. Plymouth began keeping birth records in 1880, marriage records in 1860, and death records in 1880. It began keeping land records in 1856, probate records in 1871, and court records in 1869. For more information, contact the county at 215 4th Ave. S.E., Le Mars 51031. On the attached map, Plymouth is located at A2.